Question

quy động :

7/30 ; 13/60 ; -9/40

17/60 ; -5/18 ; -64/90

Answer 1

+)\(\frac{7}{30}=\frac{7\cdot4}{30\cdot4}=\frac{28}{120}\)\(\frac{7}{30}=\frac{7\cdot4}{30\cdot4}=\frac{28}{120}\); \(\frac{13}{60}=\frac{13\cdot2}{60\cdot2}=\frac{26}{120}\)

\(\frac{-9}{40}=\frac{\left(-9\right)\cdot3}{40\cdot3}=\frac{-27}{120}\)

\(\frac{17}{60}=\frac{17\cdot3}{60\cdot3}=\frac{51}{180}\) ; \(\frac{-5}{18}=\frac{\left(-5\right)\cdot10}{18\cdot10}=\frac{-50}{180}\)

\(\frac{-64}{90}=\frac{\left(-64\right)\cdot2}{90\cdot2}=\frac{-128}{180}\)